/*
 * Copyright (c) 2022-2022 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2022-2022 Huawei Device Co., Ltd. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of
 *    conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
 *    of conditions and the following disclaimer in the documentation and/or other materials
 *    provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without specific prior written
 *    permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "string_util.h"

char *SkipSpaces(const char *str)
{
    while (isspace(*str)) {
        ++str;
    }

    return (char *)str;
}

long long SimpleStrtoll(const char *str, char **endp, unsigned int base)
{
    long long result = 0;
    long long value;
    int plusOrMinusFlag = 1;

    if (!base) {
        base = 10;
    }

    while( str && !isdigit(*str)) {
        if(*str == '-' || *str == '+') {
            break;
        }
        str++;
    }

    if (*str == '-' || *str == '+') {
        if (*str == '-') {
           plusOrMinusFlag = -1;
           str++;
        } else {
           plusOrMinusFlag = 1;
           str++;
        }
    }

    while (isdigit(*str)) {
        value = *str - '0';
        result = result * base + value;
        str++;
    }
    if (endp) {
        *endp = (char *)str;
    }
    result *= plusOrMinusFlag;

    return result;
}

void *MemdupUserNul(const char *src, size_t len)
{
    char *des = NULL;
    if (!src || len <= 0) {
        return NULL;
    }

    des = LOS_MemAlloc(OS_SYS_MEM_ADDR, len + 1);
    if (des == NULL) {
        return NULL;
    }
    if (!LOS_IsUserAddressRange((VADDR_T)(UINTPTR)src, len)) {
        memcpy_s(des, len, src, len);
        return des;
    }

    if (LOS_ArchCopyFromUser(des, src, len) != 0) {
       (void)LOS_MemFree(OS_SYS_MEM_ADDR, des);
        return NULL;
    }

    des[len] = '\0';
    return des;
}

